TRANSFORMER pankajchaudhary582@gmail.com

1. A
SEMINAR ON
“TRANSFORMER”
BACHELOR OF TECHNOLOGY
IN
ELECTRICAL & ELECTRONICS ENGINEERING
SUBMITTED
BY
PANKAJ CHAUDHARY
R.N. - 24823
UNDER THE SUPERVISION OF
ARUNESH DUTT (H.O.D)
DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING
SANJAY GANDHI INSTITUTE OF ENGINEERING & TECHNOLOGY
NEHRU GRAM BHARATI UNIVERSITY, ALLAHABAD

2. CONTENTS
1) Introduction of transformer
2) Construction of transformer
3) Types of transformer
4) Cooling system
5) Basic principle of transformer
6) Voltage and turns ratio
7) Application .

3. Transformer
 .

4. 1. A transformer is a device that transfers
electrical energy from one circuit to
another circuit through the medium of
magnetic field and without a change in
frequency .
• This changing magnetic field induces a
changing voltage in the second circuit (the
secondary). This effect is called mutual
induction.

5. Construction
 A single phase transformer consist of primary
and secondary winding put on a magnetic core
is used to confine flux to a definite path .
Transformer cores are made from thin sheet
of high great of silicon steel.
The lamination reduce eddy-current loss and
the silicon steel reduce hysteresis loss.
There are two types of transformer,
1. Core type transformer
2. Shell type transformer

6. 1.- Core type transformer
The magnetic core is a stack of thin silicon steel
lamination about 0.35 mm thick for 50 Hz
Frequency .
The core is made of cold / role , grain ,oriented
sheet steel (CRGO).
The core is used to reduces eddy current losses
the concentric coils are used for core type
transformer , and this is suitable for high voltage
,high power.

7. 2.- Shell type transformer
 In shell type the steel core surrounds a part
of the winding .
For shell type transformer the interloped or
sandwich coils are used . This is preferred for
low voltage and low power levels,

8. COOLING SYSTEM
Three-phase oil-cooled
transformer with cover cut away.
The oil reservoir is visible at the
top. Reductive fins aid the
dissipation of heat.

9.  Basic principle of Transformer:
• TRANSFORMERS
RULES
Transformer is based
on two principles:
Firstly , that an
electric
current can produce a
magnetic.
Secondly,
electromagnetic
induction.

10.  E.M.F EQUATION OF TRANSFORMER
 E = 4.44ϕmfT
VOLTAGE & TURNS RATIO
V1 / V2 = T1/ T2

11. APPLICATION
A major application of transformers is to increase voltage
before transmitting electrical energy over long distances
through wires. Wires have resistance and so dissipate
electrical energy at a rate proportional to the square of the
current through the wire. By transforming electrical power
to a high-voltage (and therefore low-current) form for
transmission and back again afterward, transformers
enable economical transmission of power over long
distances. Consequently, transformers have shaped the
electricity supply industry, permitting generation to be
located remotely from points of demand. All but a tiny
fraction of the world's electrical power has passed through
a series of transformers by the time it reaches the
consumer.

12. THANKYOU
abhayc582@gmail.com
.